1. Boundary Conditions Samuel Chong Repair Team STARS Project
15-413
Boundary Conditions
Samuel Chong
Repair Team
STARS Project
Carnegie Mellon University
11 November 1999 2
11 November 1999
Sticky Technology for Augmented Reality Systems

2. Sticky Technology for Augmented Reality Systems
Subsystem Breakdown
Augmented Reality
Authoring
Inspection
Modeling
Repair
Workflow
11 November 1999
Sticky Technology for Augmented Reality Systems

3. Subsystem Dependencies
11 November 1999
Sticky Technology for Augmented Reality Systems

4. Sticky Technology for Augmented Reality Systems
Initialization
Augmented Reality
UI service provider
No data required, no other systems required
Expects widgets from Modeling, Inspection, and Repair
Authoring
Access into the workflow database must be available
An initialization data file must be available
Paper document sources must be available
11 November 1999
Sticky Technology for Augmented Reality Systems

5. Initialization (cont)
Inspection
Augmented Reality must provide its services
Modeling
Workflow database must be available for data on the airplane
11 November 1999
Sticky Technology for Augmented Reality Systems

6. Initialization (cont)
Repair
Inspection should provide its visual UI for workorder and sticky navigation
Workflow database should provide documents such as workorders and IETMs
Workflow
Server requires a user data file for authorization purposes
Client has no initialization dependencies
11 November 1999
Sticky Technology for Augmented Reality Systems

7. Sticky Technology for Augmented Reality Systems
Termination
Workflow
Database should be highly available; i.e. termination is not a normal occurrence
Client has no restrictions on termination
Workflow is unaffected by the termination of other systems
Authoring
System is only required during creation and modification of digital documents, and will terminate once that is done
Termination does not affect other subsystems
11 November 1999
Sticky Technology for Augmented Reality Systems

8. Sticky Technology for Augmented Reality Systems
Termination
Augmented Reality
Should terminate only when PEDD is not being used
If terminated, other subsystems running on the PEDD will no longer receive input events except through speech
Repair
Should terminate once the repair is done
If terminated, other subsystems running on the PEDD can no longer be speech-controlled
11 November 1999
Sticky Technology for Augmented Reality Systems

9. Sticky Technology for Augmented Reality Systems
Termination
Modeling
Will terminate when maintenance is over
Does not affect other subsystems when terminated
Inspection
Will terminate once maintenance is over
Data must be saved to Workflow database
Termination will render Repair subsystem non-functional
11 November 1999
Sticky Technology for Augmented Reality Systems

10. Sticky Technology for Augmented Reality Systems
Failure Overview
Communications failure
Likely to be a common problem because of the environment
Wireless communication, if it is not available, should be covered by a wired alternative
Data loss
True robust error recovery is beyond the scope of this phase of the project
Reinitialization of each system is the easy solution for crash recovery
11 November 1999
Sticky Technology for Augmented Reality Systems

11. Sticky Technology for Augmented Reality Systems
Failure
Workflow
Notifications
Other subsystems will have to wait until communications are restored to retrieve data
Augmented Reality
No external communications requirements
No persistent data to back up
11 November 1999
Sticky Technology for Augmented Reality Systems

12. Sticky Technology for Augmented Reality Systems
Failure
Authoring
If workflow is unavailable, no submissions are possible
Version control can provide limited protection from data loss
Modeling
Relies somewhat on the Workflow database for some necessary information
No persistent data to back up
11 November 1999
Sticky Technology for Augmented Reality Systems

13. Sticky Technology for Augmented Reality Systems
Failure
Inspection and Repair
If Workflow database is down, no data can be retrieved or submitted
All persistent data is stored in Workflow database
11 November 1999
Sticky Technology for Augmented Reality Systems